Air Lift is about $2200. Lowering springs are about $200. $350 for Swift springs. So, if you're on a budget, just get lowering springs or coils if you want to be adjustable. My roommate has air on his '06 IS350. Super comfortable especially compared to my car since I'm on coils on a stiff setting. He just upgraded his air so now he has presets available. Before, it's just a control inside the car to "manually" raise and lower the car to a certain point. His main reason for getting air is to adjust his height for shows/photo shoots. A huge con before he upgraded was his fuse for his air burned/melted, and his air gave out making his car sink like a ship. After the upgrade, if the fuse goes out, his car will stay the same height. You'll have to think about that too. In my opinion, if you're not a show car, don't get air and just get coils.
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